gistfile1.rb

def time_consuming(&block)
  raise "Must wrapping a block" unless block_given?
  t1 = Time.now
  yield
  t2 = Time.now
  puts "Time consumed: #{t2 - t1 }"
end

def hello
  count = 0
  (1..1000).each do |i|
    count += i
  end
  puts count
end

time_consuming {
  hello
}